This is what I gathered, which I think addresses your question (but let me know if it doesn’t)…
By the end of 2020, O-C will switch over two of their four US/Canada manufacturing facilities to produce the new XPS products (no HFC134a blowing agent).
And they hope in the next few years to switch over all four plants. But that is, as far as I can tell, a loose goal and voluntary.
So in the interim, there will be two product types available - the old (with HFC134a) and the new. (Including initially in WA and elsewhere with the new laws, as there will still be a stock of the old product in those places that hasn’t yet been purchased/installed.)
And O-C also aims to have a much lower GWP blowing agent (maybe even zero) within this decade.
I did not hear anything during the presentation about O-C’s fifth North American plant in Mexico.